单项选择题

A．Either a passport or a driving license.
B．Both a passport and a driving license.
C．A credit card.
D．A students’’ identity card.
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单项选择题
The best definition of biosphere . as it is used in the text is.
A．the protective envelope formed by the atmosphere around the living earth
B．that part of the earth and its atmosphere in which life can exist
C．the living things on earth whose existence is made possible by circulation of the atmosphere
D．the circulation of the atmosphere’’s contribution to life on earth
单项选择题
A．Cats can change their position while falling.B．The force of impact with the ground over four legs is spread.C．Cats can land on their feet after falling.D．Their muscles can absorb more of the force of impact.
A．Cats can change their position while falling.
B．The force of impact with the ground over four legs is spread.
C．Cats can land on their feet after falling.
D．Their muscles can absorb more of the force of impact.
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